Image Quality Problems; Troubleshooting Image Quality Problems; Initial Checks - NEC NEFAX 671 Service Manual

6.

IMAGE QUALITY PROBLEMS

6-1.

Troubleshooting Image Quality Problems

• This chapter is divided into two parts: "Initial Checks" and "Troubleshooting for Specific
Image Quality Problems".
• If an image quality problem occurs, first go through the "Initial Checks" and, if the cause
is still not identified, continue to "Troubleshooting for Specific Image Quality Problems".
6-2.

Initial Checks

• Determine if the failure is attributable to a basic cause or causes.
Section Step
Installation 1 The installation size complies with the
site requirements specified in "PRECAU-
TIONS FOR INSTALLATION" con-
tained in the "GENERAL" section.
Paper 2 The paper meets product specifica-
tions.
3 The paper is damp.
Original 4 The document is not flat.
document
5 Copies of a faint document (written in
light pencil, etc.) are being made.
6 Copies of a highly transparent docu-
ment (OHP transparencies, etc.) are
being made.
7 The CIS is dirty.
PM parts 8 PM parts relating to image formation
have reached the end of cleaning/
replacement cycles.
Adjust- 9 There are adjustments that can
ments improve image quality problems by
being performed again.
Check Result
NO
NO
YES
YES
YES
YES
YES
YES
YES
T-26
Action
Change the instal-
lation site.
Instruct the user
to use recom-
mended paper
that meets prod-
uct specifications.
Change the
paper.
Instruct the user
on the correct
methods for stor-
ing paper.
Correct the docu-
ment.
Instruct the user
to use a docu-
ment with an
appropriate image
density.
Instruct the user
on how to copy
transparent docu-
ments.
Clean the CIS.
Clean or replace
the PM parts.
Perform the
adjustment again.